Re: [Amps] High Voltage Switching Supply (Bob D.)

[A J <iamfromcanadaalso@gmail.com>]

I was given two Lambda 202A-3KV-POS-PFC I have no idea what they came 
out of.
Have not had the opportunity to test them. I posted the specs of what 
the manufacturer rated them. Which seems would be fine for many 
applications.
No idea of they will even work in an amp or what the output looks like 
or how loud the fans are.
I have seen these on ebay for ~150.00

Something like this might be what you are looking for.

AJ___ VE3HJ

Input   

Single-phase

Input Voltage Range[AC]         

180 to 254VAC

Input Frequency Range   

47 to 63Hz

Rated Output Voltage[DC]        

3000Vdc

Output Voltage Range[DC]        

0 to 3000V

Average Capacitor Charging Power        

2000J/sec

Peak Capacitor Charging Power   

2200J/sec

Charge Current  

1.465A

Continuous DC Current   

665mA

Continuous DC Power     

2kW

Polarity        

Positive

Power Factor    

0.98

Efficiency      

85% Typ.


On 3/5/24 12:20, Victor Rosenthal 4X6GP wrote:
> I don't know if it's been mentioned yet, but a 'feature' of any supply 
> for a microwave oven is that it is designed for a short duty cycle.  A 
> "1500-watt" supply will not provide 1500 watts for amplifying 
> compressed SSB, CW, or digital transmissions over a period of time of 
> more than a few minutes. You would have to derate it and probably 
> provide cooling.
> 73, Victor, 4X6GP
> Rehovot, Israel
> Formerly K2VCO
> CWops no. 5
> http://www.qsl.net/k2vco
>
> On 05/03/2024 17:09, Bob D. wrote:
> > Hi Steve,
> >
> > "Well, there's no free lunch... Although these inverters present an
> > interesting idea, this particular one uses a flyback transformer to
> > generate the HV, which is unregulated and so varies between 2200 and as
> > much as 6 kV, the youtube author said at one point in his first video."
> >
> > The supplies are tightly regulated.They are regulated for power via 
> > current
> > sensing on the AC mains side of things. Something like 2% per one 
> > article.
> > It's what makes that type oven so nice in the kitchen. The one in my
> > kitchen can thaw from the freezer without cooking!
> > It will melt butter without popping. Best thing is the "sensor reheat"
> > mode, It steams vegetables perfectly.
> >
> > I am not an EE and welcome any assistance in understanding this thing.
> >
> > I think the small IGBT heatsink is possible because the flyback topology
> > allows for switching at zero current(voltage).
> >
> > So far I've gathered that:
> > The cook power setting signal is PWM 220Hz(per the referenced videos) 
> > with
> > no indication as to delay or hysterisis, if any, in response;
> > 220Hz will limit the minimum response time of any voltage regulation
> > feedback scheme.
> >
> > My thoughts are: That a minimum load and enough capacitance will 
> > allow me
> > to repurpose the cook power setting and hopefully hold voltage to within
> > 10%;
> > There is minimal filtering on DC feeding the inverter so 20 uFd 
> > should be
> > adequate for filtering the 120Hz feed through; If the power control
> > feedback response
> > is no more than a cycle or so at 220 Hz, the 20uf will be adequate; My
> > first task in learning if this will work is to measure the response 
> > time of
> > the power feedback loop;
> > If the existing control loop is too slow, an impractical amount of
> > capacitance may be required for ham amplifier regulation.
> >
> >
> > 73, -bob ah7i
> >
> >
> > Not knowing specs for the black box regulator, I'm doubtful there us any
> > approach to learning if this will work aside from cut and try.
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--
Knowledge is Power and Power is Knowledge.___AJ___1967
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